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		<title>bootstrap练习</title>
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	<body>
		
		<nav class="navbar-default">
		<div class="container-fluid">
			<!-- Brand and toggle get grouped for better mobile display -->
			<div class="navbar-header">
				<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
					<span class="sr-only">Toggle navigation</span>
					<span class="icon-bar"></span>
					<span class="icon-bar"></span>
					<span class="icon-bar"></span>
				</button>
				<a class="navbar-brand" href="#">Brand</a>
			</div>

			<!-- Collect the nav links, forms, and other content for toggling -->
			<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
				<ul class="nav navbar-nav">
					<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
					<li><a href="#">Link</a></li>
					<li class="dropdown">
						<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
						<ul class="dropdown-menu">
							<li><a href="#">Action</a></li>
							<li><a href="#">Another action</a></li>
							<li><a href="#">Something else here</a></li>
							<li role="separator" class="divider"></li>
							<li><a href="#">Separated link</a></li>
							<li role="separator" class="divider"></li>
							<li><a href="#">One more separated link</a></li>
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				<form class="navbar-form navbar-left">
					<div class="form-group">
						<input type="text" class="form-control" placeholder="Search">
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					<button type="submit" class="btn btn-default">Submit</button>
				</form>
				<ul class="nav navbar-nav navbar-right">
					<li><a href="#">Link</a></li>
					<li class="dropdown">
						<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
						<ul class="dropdown-menu">
							<li><a href="#">Action</a></li>
							<li><a href="#">Another action</a></li>
							<li><a href="#">Something else here</a></li>
							<li role="separator" class="divider"></li>
							<li><a href="#">Separated link</a></li>
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			</div><!-- /.navbar-collapse -->
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<div class="container-fluid">
	<div class="row box">
		<div class="item col-md-3 col-sm-4 col-xs-6">
			<div>
				item
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		<div class="item col-md-3 col-sm-4 col-xs-6">
			<div>
				item
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		<div class="item col-md-3 col-sm-4 col-xs-6">
			<div>
				item
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		</div>
		<div class="item col-md-3 col-sm-4 col-xs-6">
			<div class="row">
				<div class="col-sm-6">
					item
				</div>
				<div class="col-sm-6">
					item
				</div>
			</div>
		</div>
	</div>
</div>
		<script src="js/jquery-3.3.1.min.js" type="text/javascript" charset="utf-8"></script>
		<script src="bootstrap/js/bootstrap.min.js" type="text/javascript" charset="utf-8"></script>
	</body>
</html>